DAE Error -4 upon launching Pro Tools 5.3.1 for HD on Macintosh

DAE Error -4 upon launching Pro Tools 5.3.1 for HD on Macintosh.

This can be caused by launching the 5.3 application (probably located in the Obsoleted Digidesign Software folder), then subsequently launching Pro Tools 5.3.1 without restarting the computer first.

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